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Low biosorption of PVA coated engineered magnetic nanoparticles in granular sludge assessed by magnetic susceptibility

Herrling, Maria Pia and Fetsch, Katharina L. and Delay, Markus and Blauert, Florian and Wagner, Michael and Franzreb, Matthias and Horn, Harald and Lackner, Susanne (2015):
Low biosorption of PVA coated engineered magnetic nanoparticles in granular sludge assessed by magnetic susceptibility.
In: Science of The Total Environment, pp. 43-50, 537, ISSN 0048-9697,
DOI: 10.1016/j.scitotenv.2015.07.161,
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S0048969715...],
[Article]

Abstract

When engineered nanoparticles (ENP) enter into wastewater treatment plants (WWTP) their removal from the water phase is driven by the interactions with the biomass in the biological treatment step. While studies focus on the interactions with activated flocculent sludge, investigations on the detailed distribution of ENP in other types of biomass, such as granulated sludge, are needed to assess their potential environmental pollution. This study employed engineered magnetic nanoparticles (EMNP) coated with polyvinyl alcohol (PVA) as model nanoparticles to trace their fate in granular sludge from WWT. For the first time, magnetic susceptibility was used as a simple approach for the in-situ quantification of EMNP with a high precision (error < 2%). Compared to other analytical methods, the magnetic susceptibility requires no sample preparation and enabled direct quantification of EMNP in both the aqueous phase and the granular sludge. In batch experiments granular sludge was exposed to EMNP suspensions for 18 h. The results revealed that the removal of EMNP from the water phase (5–35%) and biosorption in the granular sludge were rather low. Less than 2.4% of the initially added EMNP were associated with the biomass. Loosely bounded to the granular sludge, desorption of EMNP occurred. Consequently, the removal of EMNP was mainly driven by physical co-sedimentation with the biomass instead of sorption processes. A mass balance elucidated that the majority of EMNP were stabilized by particulate organic matter in the water phase and can therefore likely be transported further. The magnetic susceptibility enabled tracing EMNP in complex matrices and thus improves the understanding of the general distribution of ENP in technical as well as environmental systems.

Item Type: Article
Erschienen: 2015
Creators: Herrling, Maria Pia and Fetsch, Katharina L. and Delay, Markus and Blauert, Florian and Wagner, Michael and Franzreb, Matthias and Horn, Harald and Lackner, Susanne
Title: Low biosorption of PVA coated engineered magnetic nanoparticles in granular sludge assessed by magnetic susceptibility
Language: English
Abstract:

When engineered nanoparticles (ENP) enter into wastewater treatment plants (WWTP) their removal from the water phase is driven by the interactions with the biomass in the biological treatment step. While studies focus on the interactions with activated flocculent sludge, investigations on the detailed distribution of ENP in other types of biomass, such as granulated sludge, are needed to assess their potential environmental pollution. This study employed engineered magnetic nanoparticles (EMNP) coated with polyvinyl alcohol (PVA) as model nanoparticles to trace their fate in granular sludge from WWT. For the first time, magnetic susceptibility was used as a simple approach for the in-situ quantification of EMNP with a high precision (error < 2%). Compared to other analytical methods, the magnetic susceptibility requires no sample preparation and enabled direct quantification of EMNP in both the aqueous phase and the granular sludge. In batch experiments granular sludge was exposed to EMNP suspensions for 18 h. The results revealed that the removal of EMNP from the water phase (5–35%) and biosorption in the granular sludge were rather low. Less than 2.4% of the initially added EMNP were associated with the biomass. Loosely bounded to the granular sludge, desorption of EMNP occurred. Consequently, the removal of EMNP was mainly driven by physical co-sedimentation with the biomass instead of sorption processes. A mass balance elucidated that the majority of EMNP were stabilized by particulate organic matter in the water phase and can therefore likely be transported further. The magnetic susceptibility enabled tracing EMNP in complex matrices and thus improves the understanding of the general distribution of ENP in technical as well as environmental systems.

Journal or Publication Title: Science of The Total Environment
Volume: 537
Uncontrolled Keywords: Engineered magnetic nanoparticles Granular biomass Wastewater treatment Magnetic susceptibility Mass balance
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR > Wastewater Engineering
Date Deposited: 11 Apr 2018 07:22
DOI: 10.1016/j.scitotenv.2015.07.161
Official URL: http://www.sciencedirect.com/science/article/pii/S0048969715...
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